United States. Dept. of Agriculture. Economic Research Service, United States. World Agricultural Outlook Board, & United States. World Food and Agricultural Outlook and Situation Board. (1981). World agriculture outlook & situation. The Service.
Citação do estilo Chicago (17ª ed.)United States. Dept. of Agriculture. Economic Research Service, United States. World Agricultural Outlook Board, e United States. World Food and Agricultural Outlook and Situation Board. World Agriculture Outlook & Situation. [Washington, D.C.]: The Service, 1981.
Citação MLA (8ª ed.)United States. Dept. of Agriculture. Economic Research Service, et al. World Agriculture Outlook & Situation. The Service, 1981.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.